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/* Find matching transformation algorithms and initialize steps.
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <stdlib.h>
#include <gconv_int.h>
int
internal_function
__gconv_open (const char *toset, const char *fromset, gconv_t *handle)
{
struct gconv_step *steps;
size_t nsteps;
gconv_t result = NULL;
size_t cnt = 0;
int res;
res = __gconv_find_transform (toset, fromset, &steps, &nsteps);
if (res == GCONV_OK)
{
/* Allocate room for handle. */
result = (gconv_t) malloc (sizeof (struct gconv_info));
if (result == NULL)
res = GCONV_NOMEM;
else
{
/* Remember the list of steps. */
result->steps = steps;
result->nsteps = nsteps;
/* Allocate array for the step data. */
result->data = (struct gconv_step_data *)
calloc (nsteps, sizeof (struct gconv_step_data));
if (result->data == NULL)
res = GCONV_NOMEM;
else
{
/* Call all initialization functions for the transformation
step implemenations. */
struct gconv_step_data *data = result->data;
for (cnt = 0; cnt < nsteps; ++cnt)
{
/* If this is the last step we must not allocate an output
buffer. */
data[cnt].is_last = cnt == nsteps - 1;
/* We use the `mbstate_t' member in DATA. */
data[cnt].statep = &data[cnt].__state;
/* Allocate the buffer. */
if (!data[cnt].is_last)
{
data[cnt].outbuf =
(char *) malloc (GCONV_NCHAR_GOAL
* steps[cnt].max_needed_to);
if (data[cnt].outbuf == NULL)
{
res = GCONV_NOMEM;
break;
}
}
}
}
}
}
if (res != GCONV_OK)
{
/* Something went wrong. Free all the resources. */
int serrno = errno;
if (result != NULL)
{
if (result->data != NULL)
{
while (cnt-- > 0)
free (result->data[cnt].outbuf);
free (result->data);
}
free (result);
result = NULL;
}
__gconv_close_transform (steps, nsteps);
__set_errno (serrno);
}
*handle = result;
return res;
}
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